Test Overview
Test Usage

Prenatal screen for possible maternal-fetal blood incompatibility. Recommended at 28 weeks gestation for Rh negative women and those women at increased risk of sensitization due to clinical history and/or prior sensitization, such as previous history of antibody production, history of red cell transfusion, or placental incompetence.

Reference Range *

Negative

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Will not detect all maternal-fetal incompatibilities or all antibodies present in a patient's plasma.

Test Details
Days Set Up
Daily, 24 hours
Analytic Time

24 hours

Soft Order Code
AS
MiChart Code
Antibody Screen
Synonyms
  • Indirect Antiglobulin Test
  • Blood Type, Antibody Screen, Prenatal
  • Prenatal Antibody Screen
  • Red Cell Antibody Screen, Prenatal
Laboratory
Blood Bank
Section
Blood Bank
Specimen Requirements
Collection Instructions

Collect specimen in a pink top tube. Blood Bank is not able to share tubes with other laboratories. Specimens are unacceptable if clotted, collected in serum separator tube, contaminated, grossly hemolyzed, of inadequate volume, or not properly labeled with patient identification, including labels that have been misaligned. Required on all requisition and specimen tubes: patient's full name, patient's medical record number, legibly printed full name or unique name of person collecting the blood sample and date and time of sample collection. If testing cannot be completed within 24 hours, specimen must be refrigerated.

Alternate Specimen
Lavender top tube (intact specimen) may be substituted for a pink top. All other specimen types are unacceptable.
Normal Volume
6 mL whole blood
Minimum Volume
2 mL whole blood
Storage Temperature
Samples that cannot be tested within 24 hours should be refrigerated.
Additional Information

If Antibody Screen is positive, Antibody Identification and Prenatal Antibody Titer will be performed at an additional charge. By ordering this test the clinician acknowledges that additional reflex testing will be performed and billed at a separate additional charge if indicated.

Billing
CPT Code
86850
Fee Code
21253
NY State Approved
No